高一英語（下）必修三Unit 4 Period 1-2 教案

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1、 Unit 4 Astronomy: the science of the stars Period 1-2 Warming up & Reading Step 1 Warming up & lead in 1. Talk about science subjects T: Good morning/afternoon, everyone. What class do you have today? S1: Maths, English, Chinese, physics, history, and geology. T: What other subjects do you h

2、ave in school? S2: Computer, chemistry, biology, music, PE, and politics. T: Which is your favourite? Why? S3: My favourite one is …because it’s very interesting/exciting/instructive/… S4: I like …best because … T: Which ones are science subjects? S5: Physics, chemistry, biology, geology and

3、 mathematics. T: All these subjects play an important role in the study of science. What subjects are used to study medicine? How about biochemistry? What about geophysics? What subjects are part of astronomy? T: What does astronomy deal with? S10: Astronomy is the scientific study of the unive

4、rse and the heaven bodies (such as the sun, moon, and stars), gas, and dust within it. T: What do we call people who study astronomy? S11: Astronomer. 2. Talk about universe and solar system T: Let’s follow this astronomer to learn about universe. How did the universe come into being? S12: A

5、fter the “Big Bang”, the universe came into being. T: Do you know the solar system in the universe? What is it made up of? S13: The solar system contains eight planets and many comets and other objects. (Note：According to the present day scientific study, there are only eight planets, with the

6、 Pluto excluded.) T: Can you name the eight planets? S14: The Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. T: Which planet do we live on? Can you describe what it looks like? S15: Earth. It supports a variety of life and 70% of the earth is covered with seas or oceans

7、. T: Is there life on other planets? S16: Not yet. T: Right, there is a famous saying “Water is the headspring of life”. But how did the water appear on the earth? If you want to get the correct answer, please read the passage on P25. It will tell you. Step 2 Reading 1. Get the Ss to go thr

8、ough Paragraph 1 on P 25 and find the answers to the following questions Qs: ① What did the earth look like after the “Big Bang”? (a cloud of energetic dust) ② How did the earth change afterwards? (…combine into a solid ball) ③ What happened to the ball? (explode…make the earth’s atmosph

9、ere) ④ How did the water begin to appear? （cool down） ⑤ Did water stay on the other planets or satellites? (disappear) ⑥ Water was important for the beginning of life. How did water make life develop? (dissolve harmful gases into …) T: With water, life began and developed on the earth

10、. How did life develop through history? 2. Make the Ss read paragraphs 2-3 and finish the following chart. A cloud of dust →a solid ball →presence of water →small plants grow on the water→ shellfish and other fish appear →plants begin to grow on dry land→ insects and amphibians appear→ retiles app

11、ear →dinosaurs appear→ mammals appear Q: Why was it necessary for plants to grow before animals? (Plants provided oxygen for animals to breathe.) 3. Retell Suppose you are Dr. … who studies astronomy. You are invited to give a speech to the school students about the development of life on “Eart

12、h Day” (April 22nd). Good morning/afternoon. I am Dr…. I am greatly honored to be here to give you a speech about the development of life”. … 4. Let the Ss read paragraph 4 and think over the problems caused by humans to the earth. T: Earth is home to us the living things. We ought to take good

13、care of it. Do we human beings look after the earth well? What problems have been caused by humans to the earth? (air/water/earth pollution, global warming, desertification, endangered wildlife…) Step 3 Activities 1. Activity 1: We make our home earth in danger. If we still keep doing damage to t

14、he earth, we will be homeless one day. It is time we took action and protected it. Discuss in groups “ How to protect our earth and make it a better place to live on?” 2. Activity 2: Suppose you are to design an activity for your school on Earth Day, which is intended to call on teachers and studen

15、ts to protect the earth. Work in groups and choose a reporter of your group to report your work. The following points should be included in the report of your activity. u What the activity is about u Why the activity is designed u When and where to do the activity u Who takes part in the activity u What to be done in the activity Step4 Homework: Read and learn good words, phrases or structures from Reading. 單位：湖北省荊門　姓名：李國　E_mail：liguo619@